So as you can see in my screen grab, I have a few frames where there is a lot of blending between the legs and the plate behind it. The plate is being replaced in AE. I’ve been trying all sorts of settings, but none seem to do the trick. Maybe I’m not understanding the Edge Width tool.
In this shot, I don’t understand why I’m getting such a harsh edge with such a high Edge Width?
Maybe your inner points are on the outside instead of the inside. That’s what looks like is going on here. Does the matte look feathered when you turn it on?
Use Mocha plug-in “apply matte” to get the edge width out. You can output the RGBA as cutout and comp on top.
You might be applying the Mocha shape as an AE mask, which will not come over with edge width. You could use the mask feather in AE, but Mocha’s edge width with per-point feathering gives more control.
What do you see if you go back to AE and Select Apply Matte in the Mocha plug-in? The black & white matte should match what you see in your 2nd image. You also have to select the proper Mocha layer (if you have linked a roto layer to other track layer).